also want to check out the accelerator pump injection nozzle in the throttle bore. These can plug up over time and produce a small "piddle" of fuel and not the steady stream required for enrichment on heavy acceleration. There is actually a tool for measuring the accelerator pump output at the nozzle, but I suspect one would be difficult to come by these days.

The part [nozzle] in question is #190 in the breakdown drawing above. Be careful changing this piece, if necessary, as dropping it down the bore will necessitate a rather time consuming process to remove it...